Question

If I was to get a primary key then I would do this:

if (isset($_GET['item_id']))

But if the table had a composite key (2 attributes that act as a primary key), how would I do this? My 2 attributes acting as a composite key are item_id and size_id

Answer 1

If you need to access a row in your database with 2 attributes, then you need to be doing something like:

if (isset($_GET['item_id']) && isset($_GET('size_id')))

The other part can’t magically appear unless you provide it in some other way.